Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a33a4d6dbd7e0ff…

MALICIOUS

PDF

42.1 KB Created: 2021-05-15 08:15:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 22a74fd45718b960cfbf7884c22f691c SHA-1: 59cb84e1a668889b616f2670ffba5e281baafc90 SHA-256: 9a33a4d6dbd7e0ffefd9d1b582cef00c1d997545aeec025aeb7635c6a1099c4a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds external URLs, including one pointing to a potential payload download. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/freerobux-co-game-hack PDF link annotation
    • https://mixdoors.ru:443/images/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://mixdoors.ru:443/images/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/no-human-verification_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/easy-robux-com_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mixdoors.ru:443/images/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • https://mixdoors.ru:443/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://mixdoors.ru:443/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://mixdoors.ru:443/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000480e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480E 25308 bytes
SHA-256: 4b21586527a6f848b9746f63ffdda993559fa4e9b718a1be1fd8a863460c195d
font_01_sfnt_off000082e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E7 18012 bytes
SHA-256: b26dee7669683be80ea9347b4d198a521f91968e5e17acfd13a86841c541343d

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